Condensation trails (contrails, for short) form as very hot, relatively moisture-rich air from jet exhaust cools and decompresses rapidly amidst surrounding, much colder and low-pressure air at high altitudes. Moisture in the exhaust plume condenses into ice crystals that linger for varying amounts of time, depending on humidity and winds in the surrounding air. Drier air will evaporate the … [Read more...]
Sunset through Core
An otherwise uneventful storm-observing day ended in an unexpectedly beautiful way, with the warm glows of the setting sun diffused through a rain core just dense enough to smudge the orb, but not to obscure it. Underneath, only a distant center-pivot irrigator and a small, solitary tree broke the flat plane of the High Plains. As long as there is no hail within (and there wasn't), this is a … [Read more...]
Spotlighting the Great Sand Dunes
Following a line of thunderstorms, a conveniently placed clear slot in the western clouds allowed the rays to shine only on the dunes, while the foreground grasslands and background Sangre de Cristos remained in shade, their apparent contours nearly paralleling those of the dunes. This was a special moment to witness, and not very common. Many millennia of southwest winds have dropped sand … [Read more...]
Crosstimbers Encrusted
Looking across a meadow, the Western Crosstimbers glisten in a casing of ice, courtesy of yet another central Oklahoma freezing-rain event. The branches sparkled and crackled with even the faintest passing breeze, collectively exuding a pained, strained, arthritic sound while reflecting thousands of points of light. Norman OK (24 Dec 13) Looking ESE 35.2133, -97.3704 … [Read more...]
Waterfall Rainbow
A rainbow and hints of its double float in the dancing spray of Seljalandsfoss—one of Iceland's and the Earth's most majestic waterfalls, and one offering no shortage of visual effects from front to rear to side (as here). The greatest challenge to photographing this world-class cascade, in all its personalities, was keeping spray off the lens...the second greatest, thinking to shoot in the … [Read more...]
Bradshaw: Cone and Sheath
After observing a rain-wrapped tornado crossing the Interstate near Hampton, we bailed E in the face of hail falling downshear from the "tail-end Charlie" storm in a nearly continuous line of supercells. That turned out to be the vault region for the mesocyclone that spawned this beauty. After watching it form nearby in the near view of our rear-view mirror, we zipped east a half mile or so, … [Read more...]
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